Merge topic 'cygwin-no-legacy-win32'

a429e4b9b1 CYGWIN: Drop pre-2.8.4 compatibility mode CMAKE_LEGACY_CYGWIN_WIN32

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !8096